Cover for mattress box



FIG. 1 is a front top and right perspective view of a cover for mattress box;

FIG. 2 is a front view, thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right view, thereof;

FIG. 5 is a left view, thereof;

FIG. 6 is a top plan view, thereof;

FIG. 7 is a bottom plan view, thereof; and,

FIG. 8 is a rear and top perspective view of the cover for mattress box of FIG. 1.

In FIG. 7, the cinching element of the article drawn in broken line is a portion of the cover for mattress box that forms no part of the claimed design. The area inside of the broken line depicts environmental subject matter that forms no part of the claimed design. 

CLAIM The ornamental design for a cover for mattress box, as shown and described. 